290 lines
8.7 KiB
C
290 lines
8.7 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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#include "protocol.h"
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/*
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* Driver for various UNI-T multimeters (and rebranded ones).
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*
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* Most UNI-T DMMs can be used with two (three) different PC interface cables:
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* - The UT-D04 USB/HID cable, old version with Hoitek HE2325U chip.
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* - The UT-D04 USB/HID cable, new version with WCH CH9325 chip.
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* - The UT-D01 RS232 cable.
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*
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* This driver is meant to support all three cables, and various DMMs that
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* can be attached to a PC via these cables. Currently only the UT-D04 cable
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* (new version) is supported.
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*
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* The data for one DMM packet (e.g. 14 bytes if the respective DMM uses a
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* Fortune Semiconductor FS9922-DMM4 chip) is spread across multiple
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* 8-byte chunks.
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*
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* An 8-byte chunk looks like this:
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* - Byte 0: 0xfz, where z is the number of actual data bytes in this chunk.
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* - Bytes 1-7: z data bytes, the rest of the bytes should be ignored.
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*
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* Example:
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* f0 00 00 00 00 00 00 00 (no data bytes)
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* f2 55 77 00 00 00 00 00 (2 data bytes, 0x55 and 0x77)
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* f1 d1 00 00 00 00 00 00 (1 data byte, 0xd1)
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*
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* Chips and serial settings used in UNI-T DMMs (and rebranded ones):
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* - UNI-T UT108: ?
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* - UNI-T UT109: ?
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* - UNI-T UT30A: ?
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* - UNI-T UT30E: ?
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* - UNI-T UT60E: Fortune Semiconductor FS9721_LP3
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* - UNI-T UT60G: ?
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* - UNI-T UT61B: ?
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* - UNI-T UT61C: ?
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* - UNI-T UT61D: Fortune Semiconductor FS9922-DMM4
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* - UNI-T UT61E: Cyrustek ES51922
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* - UNI-T UT70B: ?
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* - Voltcraft VC-820: Fortune Semiconductor FS9721_LP3
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* - Voltcraft VC-840: Fortune Semiconductor FS9721_LP3
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* - ...
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*/
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static void decode_packet(struct sr_dev_inst *sdi, int dmm, const uint8_t *buf)
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{
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struct sr_datafeed_packet packet;
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struct sr_datafeed_analog analog;
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struct dev_context *devc;
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struct fs9721_info info;
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float floatval;
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int ret;
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devc = sdi->priv;
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memset(&analog, 0, sizeof(struct sr_datafeed_analog));
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/* Parse the protocol packet. */
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ret = SR_ERR;
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if (dmm == UNI_T_UT61D)
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ret = sr_dmm_parse_fs9922(buf, &floatval, &analog);
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else if (dmm == VOLTCRAFT_VC820)
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ret = sr_fs9721_parse(buf, &floatval, &analog, &info);
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if (ret != SR_OK) {
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sr_err("Invalid DMM packet, ignoring.");
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return;
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}
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/* Send a sample packet with one analog value. */
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analog.probes = sdi->probes;
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analog.num_samples = 1;
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analog.data = &floatval;
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packet.type = SR_DF_ANALOG;
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packet.payload = &analog;
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sr_session_send(devc->cb_data, &packet);
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/* Increase sample count. */
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devc->num_samples++;
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}
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static int hid_chip_init(struct dev_context *devc, uint16_t baudrate)
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{
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int ret;
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uint8_t buf[5];
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/* Detach kernel drivers which grabbed this device (if any). */
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if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
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ret = libusb_detach_kernel_driver(devc->usb->devhdl, 0);
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if (ret < 0) {
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sr_err("Failed to detach kernel driver: %s.",
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libusb_error_name(ret));
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return SR_ERR;
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}
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sr_dbg("Successfully detached kernel driver.");
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} else {
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sr_dbg("No need to detach a kernel driver.");
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}
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/* Claim interface 0. */
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if ((ret = libusb_claim_interface(devc->usb->devhdl, 0)) < 0) {
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sr_err("Failed to claim interface 0: %s.",
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libusb_error_name(ret));
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return SR_ERR;
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}
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sr_dbg("Successfully claimed interface 0.");
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/* Baudrate example: 19230 baud -> HEX(19230) == 0x4b1e */
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buf[0] = baudrate & 0xff; /* Baudrate, LSB */
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buf[1] = (baudrate >> 8) & 0xff; /* Baudrate, MSB */
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buf[2] = 0x00; /* Unknown/unused (?) */
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buf[3] = 0x00; /* Unknown/unused (?) */
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buf[4] = 0x03; /* Unknown, always 0x03. */
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/* Send HID feature report to setup the baudrate/chip. */
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sr_dbg("Sending initial HID feature report.");
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sr_spew("HID init = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x (%d baud)",
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buf[0], buf[1], buf[2], buf[3], buf[4], baudrate);
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ret = libusb_control_transfer(
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devc->usb->devhdl, /* libusb device handle */
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LIBUSB_REQUEST_TYPE_CLASS |
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LIBUSB_RECIPIENT_INTERFACE |
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LIBUSB_ENDPOINT_OUT,
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9, /* bRequest: HID set_report */
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0x300, /* wValue: HID feature, report number 0 */
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0, /* wIndex: interface 0 */
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(unsigned char *)&buf, /* payload buffer */
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5, /* wLength: 5 bytes payload */
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1000 /* timeout (ms) */);
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if (ret < 0) {
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sr_err("HID feature report error: %s.", libusb_error_name(ret));
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return SR_ERR;
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}
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if (ret != 5) {
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/* TODO: Handle better by also sending the remaining bytes. */
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sr_err("Short packet: sent %d/5 bytes.", ret);
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return SR_ERR;
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}
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sr_dbg("Successfully sent initial HID feature report.");
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return SR_OK;
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}
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static void log_8byte_chunk(const uint8_t *buf)
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{
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sr_spew("8-byte chunk: %02x %02x %02x %02x %02x %02x %02x %02x "
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"(%d data bytes)", buf[0], buf[1], buf[2], buf[3],
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buf[4], buf[5], buf[6], buf[7], (buf[0] & 0x0f));
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}
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static void log_dmm_packet(const uint8_t *buf)
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{
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sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x"
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" %02x %02x %02x %02x %02x %02x %02x",
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buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6],
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buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);
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}
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static int uni_t_dmm_receive_data(int fd, int revents, int dmm, void *cb_data)
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{
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struct sr_dev_inst *sdi;
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struct dev_context *devc;
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int i, ret, len, num_databytes_in_chunk;
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uint8_t buf[CHUNK_SIZE];
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uint8_t *pbuf;
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static gboolean first_run = TRUE, synced_on_first_packet = FALSE;
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static uint64_t data_byte_counter = 0;
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(void)fd;
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(void)revents;
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sdi = cb_data;
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devc = sdi->priv;
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pbuf = devc->protocol_buf;
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/* On the first run, we need to init the HID chip. */
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if (first_run) {
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/* TODO: The baudrate is DMM-specific (UT61D: 19230). */
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if ((ret = hid_chip_init(devc, 19230)) != SR_OK) {
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sr_err("HID chip init failed: %d.", ret);
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return FALSE;
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}
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memset(pbuf, 0x00, NUM_DATA_BYTES);
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first_run = FALSE;
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}
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memset(&buf, 0x00, CHUNK_SIZE);
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/* Get data from EP2 using an interrupt transfer. */
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ret = libusb_interrupt_transfer(
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devc->usb->devhdl, /* libusb device handle */
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LIBUSB_ENDPOINT_IN | 2, /* EP2, IN */
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(unsigned char *)&buf, /* receive buffer */
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CHUNK_SIZE, /* wLength */
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&len, /* actually received byte count */
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1000 /* timeout (ms) */);
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if (ret < 0) {
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sr_err("USB receive error: %s.", libusb_error_name(ret));
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return FALSE;
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}
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if (len != CHUNK_SIZE) {
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sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE);
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/* TODO: Print the bytes? */
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return FALSE;
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}
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log_8byte_chunk((const uint8_t *)&buf);
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if (buf[0] != 0xf0) {
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/* First time: Synchronize to the start of a packet. */
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if (!synced_on_first_packet) {
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if (dmm == UNI_T_UT61D) {
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/* Valid packets start with '+' or '-'. */
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if ((buf[1] != '+') && buf[1] != '-')
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return TRUE;
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} else if (dmm == VOLTCRAFT_VC820) {
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/* Valid packets have 0x1 as high nibble. */
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if (!sr_fs9721_is_packet_start(buf[1]))
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return TRUE;
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}
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synced_on_first_packet = TRUE;
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sr_spew("Successfully synchronized on first packet.");
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}
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num_databytes_in_chunk = buf[0] & 0x0f;
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for (i = 0; i < num_databytes_in_chunk; i++)
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pbuf[data_byte_counter++] = buf[1 + i];
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/* TODO: Handle > 14 bytes in pbuf? Can this happen? */
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if (data_byte_counter == NUM_DATA_BYTES) {
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log_dmm_packet(pbuf);
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data_byte_counter = 0;
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if (dmm == VOLTCRAFT_VC820) {
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if (!sr_fs9721_packet_valid(pbuf)) {
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sr_err("Invalid packet.");
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return TRUE;
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}
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}
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decode_packet(sdi, dmm, pbuf);
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memset(pbuf, 0x00, NUM_DATA_BYTES);
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}
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}
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/* Abort acquisition if we acquired enough samples. */
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if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
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sr_info("Requested number of samples reached.");
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sdi->driver->dev_acquisition_stop(sdi, cb_data);
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}
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return TRUE;
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}
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SR_PRIV int uni_t_ut61d_receive_data(int fd, int revents, void *cb_data)
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{
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return uni_t_dmm_receive_data(fd, revents, UNI_T_UT61D, cb_data);
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}
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SR_PRIV int voltcraft_vc820_receive_data(int fd, int revents, void *cb_data)
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{
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return uni_t_dmm_receive_data(fd, revents, VOLTCRAFT_VC820, cb_data);
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}
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